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Articles 2011 - 2040 of 5168
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Nutrients Influence Diet Selection In Herbivores, Jacob Lee Dykes
Nutrients Influence Diet Selection In Herbivores, Jacob Lee Dykes
Theses and Dissertations
Natural selection should favor selective foraging in deer to choose among nutrients in plant communities to meet their physiological requirements. I designed a two-tier cafeteria-style experiment where I measured plant nutritional quality and white-tailed deer (Odocoileus virginianus) use on 1) 15 species of herbaceous plants, and 2) 2 species of plants of manipulated nutrient concentrations. I tested the hypotheses: 1) deer use across plants would be influenced by plant nutrients, and 2) soil nutrients would influence plant selection by deer. My analyses indicated deer selected plants of low neutral detergent fiber and sulfur concentrations. However, deer selected for crude protein. …
Perceptions And Attitudes Of College And University Administrators Towards Secondary Agricultural Education Programs And The Ffa, Karla D. Turner-Bailey
Perceptions And Attitudes Of College And University Administrators Towards Secondary Agricultural Education Programs And The Ffa, Karla D. Turner-Bailey
Theses and Dissertations
The purpose of this study was to describe the perceptions and attitudes of college and university administrators toward secondary agricultural education programs and the FFA. The study followed a descriptive survey research design. A researcher-modified questionnaire was sent electronically through Qualtrics to 265 college and university administrators who were in charge or undergraduate programs in agriculture, natural resources, and related science programs were offered. One hundred one individuals responded in the study for a response rate of 38 percent. The data were analyzed using descriptive statistics, t-tests, and ANOVA. The study found that current college and university administrators of agriculture …
Effects Of Bacillus Subtilis-Based Probiotics On Broiler Growth And Intestine Health, Xi Wang
Effects Of Bacillus Subtilis-Based Probiotics On Broiler Growth And Intestine Health, Xi Wang
Theses and Dissertations
The objective of this research was to use Bacillus subtilis-based probiotics alone or combined with various additional antibiotic alternatives (yeast-derived prebiotics and zinc supplementation) to maintain gut health and improve growth performance of antibioticree broilers. Three consecutive studies have been conducted to evaluate dietary effects on intestinal morphology, digestive organ development, microbiota, and growth performance of commercial broilers under different coccidia-challenge circumstances. In the first study, broilers were raised under commercial conditions, without coccidia-challenge (Chapter III). Broilers fed diets supplemented with antibiotics exhibited the highest body weight gain (BWG) from d 15 to 27. Broilers fed diets supplemented with B. …
Establishing Defoliation Thresholds In Peanut (Arachis Hypogaea (L.)) In Mississippi, Chadwick Cameron Abbott
Establishing Defoliation Thresholds In Peanut (Arachis Hypogaea (L.)) In Mississippi, Chadwick Cameron Abbott
Theses and Dissertations
Foliage feeding insects like fall armyworm (FAW) [Spodoptera frugiperda (J. E. Smith)], granulate cutworm (GCW) [Feltia subterranean (F.)], velvetbean caterpillar (VBC) [Anticarsia gemmatalis (Hübner)] and corn earworm (CEW) [Helicoverpa zea (Boddie)] in peanut (Arachis hypogaea (L.)) and their effects on canopy defoliation and the resultant yield loss is outdated and essentially non-existent in Mississippi. With the expansion of peanuts throughout the state since 2012, growers struggle to manage foliageeeding pests in peanut. The lack of current information regarding insect pressure and economic injury levels is troublesome; especially with newer, high yielding, disease resistant cultivars. Research was required to understand how …
Evaluation Of A Serine Hydrolase Inhibitor Jzl184 As An Immunomodulator Against Avian Pathogenic Escherichia Coli O78 In Chickens, Cherry Pei-Yee Ho
Evaluation Of A Serine Hydrolase Inhibitor Jzl184 As An Immunomodulator Against Avian Pathogenic Escherichia Coli O78 In Chickens, Cherry Pei-Yee Ho
Theses and Dissertations
Chickens in the poultry industry are reared under intensive conditions where they are often exposed to opportunistic pathogens. Escherichia coli strain O78 is responsible for about half of the cases of avian colisepticemia. Potential therapeutic treatments have been proposed to inhibit the hydrolases that controls the endogenous levels of the endocannabinoid, 2-arachidonoylglycerol (2-AG). 2-AG is the full agonist at the CB2 receptors of the endocannabinoid system expressed among leukocytes and it plays a role in mediating the activation of phagocytic macrophages. It is speculated that elevating 2- AG levels could increase macrophage cytokines and promote the recruitment of immune cells …
An Investigation Of The Barriers That Influence Extension Employees' Attitudes Toward Social Media Use At Mississippi State University, Jamal Mohammed Alotaibi
An Investigation Of The Barriers That Influence Extension Employees' Attitudes Toward Social Media Use At Mississippi State University, Jamal Mohammed Alotaibi
Theses and Dissertations
Many Extension organizations in the United States utilize social media to communicate with clients and deliver Extension educational programs. The purpose of this study was to investigate what social media platform Extension employees were using as a communication tool to deliver educational programs, and to examine factors influencing Extension employees’ attitude toward using social media with Mississippi State University Extension. The study followed a descriptive correlational design, using a researcher- developed questionnaire. Data were collected via Qualtrics. A total of 170 Extension faculty and agents responded to the questionnaire. Most of respondents were Extension agents, white, with an equal percentage …
Vitamin D Deficiency And Supplemental Use In Pregnancy: A Systematic Review And Meta-Analysis, Christine Rogers-Kelly
Vitamin D Deficiency And Supplemental Use In Pregnancy: A Systematic Review And Meta-Analysis, Christine Rogers-Kelly
Theses and Dissertations
Vitamin D inadequacy is highly prevalent among pregnant women worldwide. Inadequacy or deficiency of vitamin D can lead to adverse outcomes during pregnancy such as pre-eclampsia, gestational diabetes, and caesarian section. A systematic review and meta-analysis were conducted to examine the effectiveness of vitamin D supplementation on serum vitamin D status during pregnancy in randomized controlled trials (RCTs). A search was conducted in PubMed, Scopus, ProQuest, EBSCO, Cochrane CENTRAL Database of Controlled Clinical Trials, PsycINFO, CINAHL, and Google Scholar, in addition to searching reference lists in published reviews. A comprehensive list of RCTs of vitamin D status and supplemental use …
Spatiotemporal Dynamics Of Multi-Scale Habitat Selection In An Invasive Generalist, Kelsey Elizabeth Paolini
Spatiotemporal Dynamics Of Multi-Scale Habitat Selection In An Invasive Generalist, Kelsey Elizabeth Paolini
Theses and Dissertations
Spatiotemporal dynamics of resource availability can produce markedly different patterns of landscape utilization which necessitates studying habitat selection across biologically relevant extents. Feral pigs (Sus scrofa) are a prolifically expanding, generalist species and researchers have yet to understand fundamental drivers of space use in agricultural landscapes within the United States. To study multi-scale habitat selection patterns, I deployed 13 GPS collars on feral pigs within the Mississippi Alluvial Valley. I estimated resource selection using mixed-effects models to determine how feral pigs responded to changes in forage availability and incorporated those results with autocorrelated kernel density home range estimates. My results …
Substrate Availability In The Upper Cretaceous Oyster Exogyra Costata, Marvin Kunath
Substrate Availability In The Upper Cretaceous Oyster Exogyra Costata, Marvin Kunath
Theses and Dissertations
The extinct oyster Exogyra (Ostreoida: Gryphaeidae) thrived during the Cretaceous Period. The Genus was especially abundant in the southern parts of the United States, as these areas were once covered under a shallow sea. Left (lower) valves of the species Exogyra costata (Say, 1820), show different variations of the shells including differences in size and scarring of the scar remaining from the point of substrate attachment. The scars are often created by attaching to another organism, leaving an impression of it via a process called bioimmuration. This research analyses specimens from three sites within two different geological formations (Owl Creek …
Influence Of Strain And Temperature On Growth, Survival And Biofilm Formation By Listeria Monocytogenes And Salmonella Spp. In High And Low Concentrations Of Catfish Mucus Extract On Four Food-Contact Surfaces And Their Destruction, Nitin Dhowlaghar
Theses and Dissertations
According to USDA-FSIS reports, L. monocytogenes and Salmonella are two important foodborne pathogens that are prevalent throughout catfish environment. Channel catfish (Ictalurus punctatus) is the most important aquaculture species in the United States accounting for more than 60% of its aquaculture production. The objectives of this study were to determine the effect of strain, temperature concentration on the growth, survival and biofilm formation of L. monocytogenes and Salmonella using catfish mucus extract on different food-contact surfaces. Growth and survival of L. monocytogenes and Salmonella was greater at the higher concentration of mucus extract at both 10°C and 22°C. In 15 …
Material Characterization Using Laser-Induced Breakdown Spectroscopy, Chet Raj Bhatt
Material Characterization Using Laser-Induced Breakdown Spectroscopy, Chet Raj Bhatt
Theses and Dissertations
Laser-induced breakdown spectroscopy (LIBS) has been established as a rapid, in situ, and real-time spectroscopic analytical technique for material characterization. It is very handy for the study of all kinds of materials irrespective of their state. After being used for a Mars mission, LIBS has gained global attention and many scientific researches are investigating its applications. The main objective of this dissertation is to study the possibility of using laser spectroscopic sensing techniques for material characterization and if possible, to develop methodologies. Studying molecular emission spectra for elemental analysis is a relatively new trend in the spectroscopic field. Molecular emission …
Melatonin Implants During Pregnancy On Maternal Hemodynamics And Growth Of Offspring In Beef Cattle, Keelee Jae Mccarty
Melatonin Implants During Pregnancy On Maternal Hemodynamics And Growth Of Offspring In Beef Cattle, Keelee Jae Mccarty
Theses and Dissertations
Melatonin is a strong antioxidant that has previously been observed to increase uteroplacental blood flow and increase postnatal calf growth when supplemented during gestation. The objective of the current study was to examine the effects of melatonin implants on uterine blood flow and subsequent offspring growth. Commercial beef heifers and cows were artificially inseminated and assigned to one of two treatment groups supplemented with (MEL) or without (CON) melatonin from days 180 to 240 of gestation. Total uterine artery blood flow was increased in MEL- versus CON-treated cattle. Fetal and birth weight were not different between treatments. However, at castration, …
Hematological And Histopathological Changes Associated With Chronic Diazinon Exposure In Alligator Gar, Atractosteus Spatula, Ahmad Salem Omar Ali
Hematological And Histopathological Changes Associated With Chronic Diazinon Exposure In Alligator Gar, Atractosteus Spatula, Ahmad Salem Omar Ali
Theses and Dissertations
Extensive use of the organophosphate diazinon has led to its accumulation in aquatic environments and negative effects on fish health. Most studies focus on the effects of short term exposure to high levels of organophosphate pesticides. This research was conducted to assess the effect of chronic sub-lethal exposure to 0, 0.01, and 0.1 mg/L diazinon for 15 and 30 days on blood parameters and histopathological damage in alligator gar, Atractosteus spatula. Fish exposed to either concentration were motionless, produced excess mucous, had lighter skin color, and had skin lesions. Blood indices of red blood cells, leukocytes and hematocrit values significantly …
Identifying Ideal Body Composition Of Female Powerlifters, Elizabeth A. Flinner
Identifying Ideal Body Composition Of Female Powerlifters, Elizabeth A. Flinner
Theses and Dissertations
Powerlifting is the sport of maximal effort of back squat, bench press and deadlift. The purpose of this study was to identify the ideal body composition of female powerlifters. Body composition measurements were taken on the day of competition on women who competed in a raw powerlifting meet in United States Powerlifting Federation using bioelectrical impedance analysis. Participants’ powerlifting experience ranged from novice to world-class lifters. One hundred ninetyive women completed the study and ages ranged from 18 to 75 years old. Mean body fat percentage (BF%) of all powerlifters was 31.21% and body mass index was 26.68. Results showed …
Exploring The Relationship Between Volunteer Motives, Satisfaction, Commitment, And Intention To Leave The Mississippi Master Gardener Program, Austin Pace Jacobs
Exploring The Relationship Between Volunteer Motives, Satisfaction, Commitment, And Intention To Leave The Mississippi Master Gardener Program, Austin Pace Jacobs
Theses and Dissertations
The purpose of this study was to explore and to examine the relationship among Mississippi Master Gardeners’ characteristics, motives for volunteering as a Master Gardener, satisfaction serving as a Master Gardener, organizational commitment, and intention to leave the Mississippi Master Gardener Program. Specifically, this research sought to determine what drives or motivates Mississippi Master Gardener volunteers to volunteer, what satisfies them, and what makes these volunteers consider leaving the Mississippi State University Extension Master Gardener programs. This study used a descriptive survey research design to examine the relationship between the variables. Sixty-one items encompassed the five-part survey which was completed …
A New Perspective On Giving-Up Density Experiments And The Landscape Of Fear, Jordan D. Mcmahon
A New Perspective On Giving-Up Density Experiments And The Landscape Of Fear, Jordan D. Mcmahon
Theses and Dissertations
Non-consumptive effects that predators have on prey are important to ecosystems. The perceived risk of predation can alter feeding behavior. Giving-up density (GUD) experiments have been a foundational method to evaluate perceived predation risk, but rely on the assumption that food preferences are absolute. However, nutritional preferences are context dependent and can change with risk. In my first chapter, I used spiders and grasshoppers to test the hypothesis that covariance in nutritional preferences and risk may confound the interpretation of GUD experiments. My results demonstrate that predation risk and nutritional preferences covary and can confound interpretation of GUD experiments. In …
Spatial And Temporal Trends In Diet For Pinfish (Lagodon Rhomboides) From Turtle Grass (Thalassia Testudinum) Beds With Contrasting Environmental Regimes In The Lower Laguna Madre, Texas, Maximiliano Barbosa
Spatial And Temporal Trends In Diet For Pinfish (Lagodon Rhomboides) From Turtle Grass (Thalassia Testudinum) Beds With Contrasting Environmental Regimes In The Lower Laguna Madre, Texas, Maximiliano Barbosa
Theses and Dissertations
Seagrass meadows in far South Texas are dominated by turtle grass (Thalassia testudinum), and juvenile pinfish (Lagodon rhomboides) are abundant grazers of seagrass epifauna. As they grow, pinfish exhibit an ontogenetic dietary shift and begin consuming increasing amounts of plant material. In this study, contrasting environmental regimes in two seagrass meadows were examined to identify how they might affect pinfish diets, diet shifts, and growth across the growing season. The eastern site was sheltered from prevailing southeasterly winds by a barrier island, while the western site was shallower and subjected to higher wind energy and turbidity. …
Reanalyzing The Activity Anorexia Protocol Using An Addiction Theory, Rolando Alfredo Botello
Reanalyzing The Activity Anorexia Protocol Using An Addiction Theory, Rolando Alfredo Botello
Theses and Dissertations
One researched and developed phenomenon is activity anorexia (AA) in rats and its resemblance to the human pathology anorexia nervosa (AN). Researchers have long relied on this comparative model for AN as AA. This study aims to reanalyze the overt physiological phenomena of AA to test an addictive theory against the prevalent AA theory. Equal numbers of subjects could eat or run during a one hour feeding period and all activity was monitored per 30 minutes. Results showed that daily running correlated with an increase in food consumption with no effect of food suppression. The only factor that regressed to …
Transitioning Adults From A Tube-Feeding To An Oral Feeding In Long-Term Care Facilities, Patricia D. Mejorado
Transitioning Adults From A Tube-Feeding To An Oral Feeding In Long-Term Care Facilities, Patricia D. Mejorado
Theses and Dissertations
The objective of this investigation is to gain information regarding the transition of adults from a tube feeding to an oral feeding in long-term care facilities. Twelve surveys were administered to the speech language pathologist population from the UTRGV and UTPA communication sciences and disorders alumni via email invitation. The survey consisted of questions regarding: years practiced in long-term care facilities, interdisciplinary collaboration, protocol and/or algorithms for transitioning patients from a tube feeding to an oral feeding, documentation programs, access to meal intakes, the SLP’s role in the transition to oral feedings, and areas of concerns regarding the transition from …
Impacts Of Sieving And Cultivation On Martian Regolith Simulant, Abdulgadir Ahmad Elnajdi
Impacts Of Sieving And Cultivation On Martian Regolith Simulant, Abdulgadir Ahmad Elnajdi
Theses and Dissertations
The effect of different size particle fractions of JSC-MARS1A on chemical and mineralogical data was examined in this study. The Powder X-ray Diffraction (PXRD) and Scanning Electron Microscopy (SEM) results showed no difference in the presence of elements or minerals of the different grain sizes of (<5mm, <1mm, <125μm, and <63μm), however, differences in abundance were noted. In addition, changes in chemical composition and mineralogy were not detected after the addition of Hoagland’s nutrient solution which had been applied prior to plant growth experiments nor after plant growth.
Identification Of Elements Essential For Replication Origin Activity In Escherichia Coli, Prassanna Rao
Identification Of Elements Essential For Replication Origin Activity In Escherichia Coli, Prassanna Rao
Theses and Dissertations
The increasing number of drug resistant pathogenic bacteria has created a growing health care crisis. Solving the crisis will require a number of solutions, among them being development of new antibiotics that target novel cell processes. Initiation of chromosomal DNA replication is one such unexploited process. Bacterial cells begin chromosome replication by building a nucleoprotein complex called the orisome which, unwinds replication origin DNA, and loads the replicative helicase. A greater understanding of how orisomes assemble, and how the assembly is regulated, should provide a source of druggable targets to be used in future antibiotic discovery efforts. However, although all …
Pit Features: A View From Grand Island, Michigan, Emily R. Bartz
Pit Features: A View From Grand Island, Michigan, Emily R. Bartz
Theses and Dissertations
Serving a multitude of functions from subterrestrial cavities of storage, basins for cooking, to vessels that securely hold pounds of rice allowing the grains to be danced upon to thresh, pit features are one of North Americas most common archaeological feature. These constructions are dug to fit a diversity of needs based on the people who manufacture them. By understanding the distinct function(s) a pit or group of pit features played at a site-level, the needs of the people who inhabited that landscape are better understood. The nature of a pit feature is to store something or process a food …
Out Of The Shell: Exploring The Phagocytic Capabilities Of The B Cell And Isolated Lymphoid Follicle-Lie Structures In The Red-Eared Slider, Trachemys Scripta, Marc A. Ashford Jr.
Out Of The Shell: Exploring The Phagocytic Capabilities Of The B Cell And Isolated Lymphoid Follicle-Lie Structures In The Red-Eared Slider, Trachemys Scripta, Marc A. Ashford Jr.
Theses and Dissertations
Management of immunity is crucial for survival in all living organisms. While there is a large amount of research for established model organisms, such as the mouse model, much less is known about reptiles. When compared to immunity in mammals, we discover many differences such as susceptibility to certain pathogens, alteration of immune processes due to environmental temperature, the total absence of certain lymphoid organs contained in mammals, among many others. Despite this, the reptile has shown in many studies that they are worthy systems to study immunity in an evolutionary perspective and recent studies may show that they may …
Markers Of Cardiometabolic Risk And Thyroid Dysfunction In U.S. Adolescents: Nhanes Iii, Jonathan Austin
Markers Of Cardiometabolic Risk And Thyroid Dysfunction In U.S. Adolescents: Nhanes Iii, Jonathan Austin
Theses and Dissertations
The global prevalence of metabolic syndrome (MetS) and its associated components (high fasting glucose, waist circumference, blood pressure, triglycerides, and low HDL) have increased over the past few decades. In addition, abnormal thyroid hormone levels have been found to manifest in a cascade of metabolic dysfunction, which may be linked to MetS in youth. PURPOSE: The purpose of the study is to investigate the association between MetS, its components, and markers of thyroid function in a nationally-representative sample of adolescents. METHODS: The National Health and Nutrition Examination Survey III (1988-1994) collected data on the components of metabolic syndrome and thyroid …
Working Women: Agricultural Intensification, Osteoarthritis In Females, And Subadult Health In Illinois Woodland And Mississippian Mortuary Contexts, Paige M. Dobbins
Working Women: Agricultural Intensification, Osteoarthritis In Females, And Subadult Health In Illinois Woodland And Mississippian Mortuary Contexts, Paige M. Dobbins
Theses and Dissertations
Temporal variation was examined in female labor associated with subsistence modifications in pre-Columbian human osteological samples from the Mississippi River valley of west-central Illinois related to weaning patterns, diet, and overall health status of subadults. This study was performed on a sample of 173 burials constituting 98 subadults and 75 adult females from temporally sequential Illinois mortuary contexts (Albany [11WT1], Kuhlman [11A163], Schroeder [11HE177], and Dickson [11F10] Mounds) that represent the transition from Middle Woodland hunter gatherers to Mississippian maize agriculturalists. This was accomplished by (1) scoring pattern and degree of dental attrition and dental caries in subadults, (2) identification …
The Effects Of A Three-Hour, After School Bout Of Sedentary Vs Active Behavior On Reward And Cognitive Control Activation In 8- To 9-Year-Old Children: A Randomized Crossover Study, Mary Linn White
Theses and Dissertations
PURPOSE: To compare the effects of after-school sedentary versus active play on activation in the reward and cognitive control regions of the brain to pictures of high- and low-calorie foods. METHODS: 32 children (12 girls, 20 boys; age 8.7 ± 0.5 years; height 137.9 ± 6.9 cm; weight 32.4 ± 6.2 kg) participated in a randomized crossover study with counterbalanced treatment conditions. Conditions took place on separate days after school and included three hours of active or sedentary play. After each condition, neural activation in reward and cognitive control regions of the brain were assessed using functional magnetic resonance imaging …
Application Of Mixture Design Response Surface Methodology For Combination Chemotherapy In Pc-3 Human Prostate Cancer Cells, Richard Vernon Oblad
Application Of Mixture Design Response Surface Methodology For Combination Chemotherapy In Pc-3 Human Prostate Cancer Cells, Richard Vernon Oblad
Theses and Dissertations
Combining chemotherapeutics to treat malignant tumors has been shown to be effectivein preventing drug resistance, tumor recurrence, and reducing tumor size. We modeledcombination drug therapy in PC-3 human prostate cancer cells using mixture design responsesurface methodology (MDRSM), a statistical technique designed to optimize compositions thatwe applied in a novel manner to design combinations of chemotherapeutics. Conventionalchemotherapeutics (mitoxantrone, cabazitaxel, and docetaxel) and natural bioactive compounds(resveratrol, piperlongumine, and flavopiridol) were used in twelve different combinationscontaining three drugs at varying concentrations. Cell viability and cell cycle data werecollected and used to plot response surfaces in MDRSM that identified the most effectiveconcentrations of each …
Comparison Of Functional, Nutritional, And Sensory Properties Of Spray-Dried And Oven-Dried Cricket (Acheta Domesticus) Powder, Fred Stephen Bassett
Comparison Of Functional, Nutritional, And Sensory Properties Of Spray-Dried And Oven-Dried Cricket (Acheta Domesticus) Powder, Fred Stephen Bassett
Theses and Dissertations
Three dried cricket products – Oven-roasted Cricket Meal (ORCM), Oven-roasted Cricket Powder (ORCP), and Spray-dried Cricket Powder (SDCP) – were prepared and compared to assess their relative nutritional, functional, and sensory properties. The range of particle sizes in SDCP was wider than that of ORCP; while SDCP had more particles in the 7.78-22.0 µm range, it also had more particles in the 176-498 µm range, which contributed to differences in functional and sensory properties. ORCM and SDCP meet the FDA definition of an "excellent source" of vitamin B2, ORCP is a "good source" of vitamin B2, …
Effects Of Acid Whey Marination On Tenderness, Sensory And Other Quality Parameters Of Beef Eye Of Round, Jason Kim
Theses and Dissertations
The growth of the Greek-style yogurt market is causing many problems for dairy companies who are trying to handle the voluminous whey by-product. Acid whey, unlike sweet whey, has a low amount of protein and high amounts of lactic acid, calcium, and other minerals. Therefore, it has limited commercial value to the food industry and often requires additional processing for disposal. Lactic acid and calcium solutions have shown efficacy in increasing the tenderness of beef and other types of meat. The purpose of this project is to investigate the use of acid whey, with its high amounts of lactic acid …
Preoperative Activity Level And Outcomes In Older Adult Cardiac Surgery Patients: A Pilot Study, Don Howard Sorensen
Preoperative Activity Level And Outcomes In Older Adult Cardiac Surgery Patients: A Pilot Study, Don Howard Sorensen
Theses and Dissertations
ABSTRACTPreoperative Activity Level and Outcomes in Older ¨Adult Cardiac Surgery Patients: A Pilot StudyDon Howard Sorensen Jr.College of Nursing, BYUMaster of SciencePurpose: To assess the relationship between preoperative physical activity levels and health related quality of life on intra- and post-hospital outcomes following scheduled cardiothoracic surgery in older adults.Rationale/Background: Adults age 50 and older tend to accumulate more sedentary time and are less physically active. Sedentary behavior is linked with early morbidity and death and may predispose patients to postoperative complications. Preoperative activity levels and its relationship to surgical outcomes is an underexplored area. Insight on this topic could influence …